Hydrogeochemistry and statistical analysis applied to understand fluoride provenance in the Guarani Aquifer System, Southern Brazil
| Autor: | Ari Roisenberg, Alexandra Vieira Suhogusoff, Maria Paula Casagrande Marimon, Antonio Pedro Viero |
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| Rok vydání: | 2012 |
| Předmět: |
Provenance
Environmental Engineering Fluorosis Dental Aquifer Fluorides chemistry.chemical_compound Geochemistry and Petrology Calcium bicarbonate Cluster Analysis Humans Environmental Chemistry Groundwater General Environmental Science Water Science and Technology Geochemical modeling Hydrology Principal Component Analysis geography geography.geographical_feature_category Environmental Exposure General Medicine Santa María Formation chemistry Clay minerals Fluoride Brazil Geology Environmental Monitoring |
| Zdroj: | Environmental Geochemistry and Health. 35:391-403 |
| ISSN: | 1573-2983 0269-4042 |
| Popis: | High fluoride concentrations (up to 11 mg/L) have been reported in the groundwater of the Guarani Aquifer System (Santa Maria Formation) in the central region of the state of Rio Grande do Sul, Southern Brazil. In this area, dental fluorosis is an endemic disease. This paper presents the geochemical data and the combination of statistical analysis (Principal components and cluster analyses) and geochemical modeling to achieve the hydrogeochemistry of the groundwater and discusses the possible fluoride origin. The groundwater from the Santa Maria Formation is comprised of four different geochemical groups. The first group corresponds to a sodium chloride groundwater which evolves to sodium bicarbonate, the second one, both containing fluoride anomalies. The third group is represented by calcium bicarbonate groundwater, and in the fourth, magnesium is the distinctive parameter. The statistical and geochemical analyses supported by isotopic measurements indicated that groundwater may have originated from mixtures of deeper aquifers and the fluoride concentrations could be derived from rock/water interactions (e.g., desorption from clay minerals). |
| Databáze: | OpenAIRE |
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